Content provider Netflix uses more bandwith online than surfing the Internet or downloading other forms of contest a new study shows.

A study published Tuesday by Sandvine Inc. shows that Netflix movies and TV shows account for nearly 30 percent of traffic into homes during peak evening hours, compared with less than 17 percent for Web browsing.

Only about a quarter of homes with broadband subscribe to Netflix, but watching movies and TV shows online takes up a lot of bandwidth compared with Web surfing, email and practically every other Internet activity except file sharing and videoconferencing.

As late as last year, both Web surfing and peer-to-peer file sharing — mainly the illegal trading of copyrighted movies — were each larger than Netflix’s traffic.

Sandvine makes equipment that helps cable and phone-company manage their Internet delivery systems. It collected data from unidentified customers for the survey. It has previously been linked to Comcast Corp., the largest Internet service provider in the U.S. Sandvine says its data should be representative of overall home Internet use.

The number of Netflix customers is growing quickly, to 23.6 million subscribers in the U.S. and Canada as of the end of March. The growing use of the streaming service is good news for the company, which is trying to reduce what it spends to mail DVDs.

This year, the number of Netflix subscribers surpassed the number of video subscribers at Comcast. Netflix’s streaming service could put it in competition with cable and satellite companies, but for now, there are few signs of people cancelling their pay-TV subscriptions in favor of Netflix, which doesn’t provide live TV.

The growth in Netflix traffic doesn’t mean overall Internet traffic is growing faster than before. Rather, it means the type of traffic that’s driving growth has shifted, as it has several times before. A few years ago, YouTube traffic was driving the growth of overall Internet traffic. It now accounts for 11 percent of traffic into the home at peak hours, according to Sandvine.

Internet service providers are increasingly placing monthly limits on each subscriber’s data consumption and charging extra when the limit is surpassed. Analysts see this strategy as insurance for the future, in case viewing shifts from traditional services to the Internet.